Panicle branching trait of rice is one of the key factors in detemining grain yield. This study was aimed to elucidate the genetic inheritance pattern of the tertiary rice panicle branches trait. Six rice populations i.e F1, F1R, F2, F2R, BC1P1, and BC1P2 generation including parental lines were generated as materials. The experiment was conducted at IPB University, Bogor, Indonesia from April 2017 to February 2019. Several parameters of genetic inheritance was observed. The result revealed that the inheritance of the tertiary panicle branching was controlled by many genes with the high broad-sense heritability and the moderate narrow-sense ones. Based on the scaling test, it was observed that additive dominant model did not fit to the number of tertiary branches and the number of grains of tertiary panicle branches. These phenomenons suspected may due probably to the effect of epistasis. In the advanced analysis employed by using the joint scaling test revealed that the gene action of the number of tertiary branches and number of grains on the tertiary branches were additive and additive×additive.

Abstract. Hastini T, Suwarno WB, Ghulamahdi M, Aswidinnoor H. 2019. Short Communication: Correlation and regression among rice panicle branches traits. Biodiversitas 20: 1140-1146. Panicle was a very important organ in rice since the grains are developed from the panicle branches. This study aimed to find out the information about the relationship among rice panicle branching traits using correlation and regression analysis. The trial was conducted at the IPB Research Station, Babakan, Bogor, Indonesia from December 2015 until April 2016. Twenty genotypes of lowland rice were used as treatments with three replications and arranged in a completely randomized design. The panicle branches traits were observed. The result showed that there was positively and a highly significant relationship among the panicle branches traits in general. Analysis using linear regression revealed that, in general, the total grains number per panicle showed the linear relationships with other traits, and only total grains number per panicle vs tertiary branches number, total grains number per panicle vs grains number of tertiary panicle branch, and total grains number per panicle vs the number of secondary branches per panicle branch showed the quadratic relationship. Among all rice panicle branching traits, the secondary panicle branches number had the highest contribution to the total grains number per panicle.

Percabangan malai merupakan salah satu kunci penentu hasil padi, namun keragaannya antar musim belum banyak dipelajari hingga saat ini. Penelitian ini bertujuan untuk mendapatkan informasi tentang interaksi genotipe × musim karakter percabangan malai padi. Percobaan dilaksanakan dari bulan April 2017 sampai dengan Maret 2018, di Kebun Percobaan IPB Babakan, Dramaga, Bogor. Lima belas genotipe padi sawah sebagai perlakuan ditanam pada musim kemarau dan musim hujan untuk mempelajari interaksi genotipe × musim. Percobaan ditata dalam rancangan acak kelompok lengkap dengan empat ulangan. Analisis yang dilakukan adalah analisis ragam per musim dan analisis ragam gabungan antar musim. Hasil percobaan menunjukkan bahwa genotipe, musim, dan interaksi genotipe × musim berpengaruh nyata pada karakter panjang malai, jumlah cabang primer, panjang cabang primer, dan panjang cabang sekunder. Informasi yang diperoleh dari hasil penelitian ini dapat bermanfaat bagi pemulia padi dalam melakukan seleksi pada karakter percabangan malai. Kata kunci: genotipe × musim, musim kemarau, musim hujan, pemuliaan padi

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